Improvement in spikes with screw-threads



I Nd. 83,699.

A. 0. & 1. L. DUNN Screw-Threaded Spike.

fizz/72507? Patented Nov 3, 1868.

. I 4 Q53 A I Wm @{CQDWV r, M i the mi saw @a'ttut time.

antruins, c. DUNN A D rsnno L. DUNN, on NEW YORK, NY, ASSIGNORS TO PHILIP DUN AND JAMns YATES, or TRENTON, NEW JERSEY.

Letters Patent No; 83,699, dated November 3, 1868.

INIPROV EMENT 'IN S PIKES WITH SCREW-THREADS.

. The Schedule referred to in these Letters Pateht and making part 0f the sa e- To an 41 001E007: A represents the spiral rib or feather, which may Be it known that W6,AL1 HEUS (LD NN d ISAAC extend from the head, or near it, to the end of the. L. DUNN, of the city, county, and State of New'York Spike of 113411, lie? the and be Placed on the: have invented a new and useful Improvement in Spikes Spike l at 811011 94 Pitch a g t, in driving and Nails; and we do hereby de l r th t th f ll i them, the rib or feather shall not break the wood, but is a full, clear, and exact description of the same, which & g B 01? 6119111161 for itself fi is driven y will enable those skilled in the art to make and use the hammer. The spike or nail, in being thus driven, .the same, reference being had to the accompan i will turn round in the wood, and be governed, in turn-' d aw gs, orm g par of this specification. dug, by the spiral rib or feather, turning more or less,

The object of this invention is to so form the spikes 'g t0 e fdfm Pitch of the used in the construction of ships, boats, and all marine The Pitch 0 piral, as before Stated, y be 811611 s vessels, and in the construction of railroads, and for all to l w h spik r n i to be driven into the W other purposes of a similar nature, and fo ll purposes with a hammer, or be forced in by a longitudinal mofor which spikes are used, and also nails used for buildtion, without breaking or forcing the rib or feather from ing-purposes, and for all other purposes for which nails its g O are used, that they shall not fail or draw out from the These spikes and nails are not intended for being wood, by any strain on the parts held togetherby them, turned i to t e W o y ny 0 or device; u n y but shall keep their places and hold to the wood, and to be driven by the hammer or sledge. accomplish the object for which spikes and nails are. It is understood that & $110113 fiitller 1113116 used; and the invention consists in forming on the s rimmediately underthe head of the spike or nail, runiace of spikes and nails a spiral rib or feather, which ning longitudinally with the spike, say about onefifth shall penetrate the wood as the spikes or 113,11 r the length of the spike, more or less, so as to prevent driven, aiid form spiral grooves therein, which rib or the spike'from t i g after h vi g 106611 feather, having thus penetrated the wood, shall hold the From this construction, it will be readily seen that spike or nail to its place, and the parts of wood through it is impossible for a spike or nail made in this manand into which they may be driven, and thereby acoom-. ner, when once driven, to become loose and turn out. plish the object for which spikes and nails are used, in We are aware that bolts, with spiral threads, are not a manner greatly superior to that of the ordinary spikes new; but the objection found in their construction has 1 and nails. 7 been, that the spiral thread has been found, in most 4 i The drawing represents a spike constructed accordeases, too close; that the strength of wood is injured u ing to our invention. The nail is made in the same by it in driving; and the object of this invention is to L manner, the only diiference being in the size. Either improve that point--to have wood between the spiral thread with sharp edges, and separate the threads, so that they may be driven without requiring too much force, and leave the wood sound, and the body or shaft of the bolt or spike solid, which cannot be, done in twisted threads.

What we claim, is

The construction of the bolt, to conform to the form shown, and in the manner described.

ALPHEUS G. DUNN.

ISAAO L. DUNN.

- may have any desired-shaped head, to adapt it to the particular purpose for which it may be used. Both the spikes and the nails are made of round rods or round wire, of any desired diameter, and of any suitable metal. v

The said rib or feather A is formed by being raised,

by means of suitable dies or presses, while the iron or -metal from which the spike or nail is made is hot,

so that, by pressing, the pores of the metal are brought together much more compactly, which gives much greatenstrength to a nailof a given size, and at the Witnesses; same time forms a most perfect rib or feather. Pn'rnn OOUTANT, f The tib or feather may be of any desired form but J oHN E. OoU TANT.

its sides should form an acute angle. 

